Update to sagemath 8.2.

Also:
- Create the sagemath-data-combinatorial_designs subpackage.
- Create the sagemath-notebook-export subpackage.
- Unbundle the LaTeX makecmds style.
- Install LaTeX style files in a more canonical place.

sagemath-atlas.patch

@@ -1,6 +1,6 @@
 diff -up src/module_list.py.orig src/module_list.py
---- src/module_list.py.orig	2017-11-08 08:34:54.635233833 -0500
-+++ src/module_list.py	2017-11-08 08:36:05.888236561 -0500
+--- src/module_list.py.orig	2018-05-16 14:13:22.021406801 -0600
++++ src/module_list.py	2018-05-16 14:15:57.654208949 -0600
 @@ -12,7 +12,7 @@ SAGE_INC = '/usr/include'
  import pkgconfig
  
@@ -23,23 +23,12 @@ diff -up src/module_list.py.orig src/module_list.py
 +lapack_library_dirs = []
 +lapack_include_dirs = [ SAGE_INC + '/lapack' ]
  
- # FFLAS-FFPACK
- fflas_ffpack_pc = pkgconfig.parse('fflas-ffpack')
-@@ -44,7 +42,9 @@ givaro_cflags = pkgconfig.cflags('givaro
- # The above cblas should already be in the list thanks to #20646
- gsl_pc = pkgconfig.parse('gsl')
- gsl_libs = gsl_pc['libraries']
--gsl_library_dirs = gsl_pc['library_dirs']
-+gsl_libs.remove('gslcblas')
-+gsl_libs.extend(cblas_libs)
-+gsl_library_dirs = list(cblas_pc['library_dirs'])
- gsl_include_dirs = gsl_pc['include_dirs']
- 
  # GD image library
+ gd_pc = pkgconfig.parse('gdlib')
 diff -up src/sage/misc/cython.py.orig src/sage/misc/cython.py
---- src/sage/misc/cython.py.orig	2017-11-08 08:36:27.499237389 -0500
-+++ src/sage/misc/cython.py	2017-11-08 08:36:37.240237762 -0500
-@@ -30,7 +30,7 @@ import pkgconfig
+--- src/sage/misc/cython.py.orig	2018-05-16 13:16:29.207708998 -0600
++++ src/sage/misc/cython.py	2018-05-16 14:15:57.656208921 -0600
+@@ -40,7 +40,7 @@ from sage.misc.sage_ostools import resto
  
  
  # CBLAS can be one of multiple implementations